According to official website of National Medical Insurance Bureau, the adjustment of medical insurance drug list is divided into enterprise declaration, formal review, expert review, negotiation and bidding. Drugs that have passed the formal evaluation need to enter the expert evaluation before they can enter the negotiation bidding. Only by successfully passing all the links of catalogue adjustment can it be finally included in the national medical insurance drug catalogue of that year. National medical insurance bidding drugs cover many treatment fields such as tumors, rare diseases and chronic diseases, which can reduce the burden of patients' medical expenses and improve the accessibility of drugs.